posted on Jun, 21 2008 @ 12:57 PM
The "grain of rice" RFID size is either obsolete or nearly so.
While commercial applications may continue to use the larger devices, RFID dust is the emerging technology.
Of course, nothing like 100 yard range is even remotely possible without powerful transmitting (to power the RFID) and very sensitive receiving (to
detect the extremely low-power response) equipment.
However, the more likely course is to install a network of sensors like those cropping up at the entrances to most stores, where anyone walking
through is scanned for an RF product tag. Such a linked network could give near-real-time tracking information in certain areas.
The danger, for those who wish to be aware of what their government is doing to them, is to assume that technology stands still. "Grain of rice"
might have been accurate 5 years ago, but it's highly unlikely that it's state-of-the-art today except for the most mundane and innocent of
activities (identifying a dog, tracking a package or pallet, etc.)